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Ashiok, Nightmare Weaver
Legendary Planeswalker — Ashiok
[+2]: Exile the top three cards of target opponent's library. [−X]: Put a creature card with mana value X exiled with Ashiok onto the battlefield under your control. That creature is a Nightmare in addition to its other types. [−10]: Exile all cards from all opponents' hands and graveyards.